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arbcombo -- Approved Amendments to the Regulations for the State Ambient Air Quality Standard for Nitrogen Dioxide (NO2)

Posted: 22 Feb 2008 17:02:35
On Tuesday, February 19, 2008, the Office of Administrative Law
approved amendments to the regulations for the State Ambient Air
Quality Standard for nitrogen dioxide (NO2). Those amendments
reduce the current 1-hour-average standard of 0.25 ppm to 0.18
ppm, not to be exceeded, and establish a new annual-average
standard of 0.030 ppm, not to be exceeded. The new standards
become effective on March 20, 2008.

ARB staff presented their recommendations to amend the NO2
standard to the Air Resources Board on February 22, 2007:
The recommendations were based on a review of the scientific
literature on the health effects of NO2 that was conducted by
staff from the Air Resources Board and the Office of
Environmental Health Hazard Assessment.  The review and final
recommendations for the NO2 standard were released in a final
staff report on January 5, 2007. 

For more information and details of the NO2  standard review
process, including the staff report, please check this site:

If you have any questions about the NO2 standard review, please
Dr. Norman Kado at (916) 323-1500, or via email at

Thank you,

Linda Smith, Ph.D., Chief, 
Health and Exposure Assessment Branch
California Air Resources Board

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